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Coordinate Repression of the Synthesis of Four Histidine Biosynthetic Enzymes by Histidine by Bruce N

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Coordinate Repression of the Synthesis of Four Histidine Biosynthetic Enzymes by Histidine by Bruce N Proceedings of the NATIONAL ACADEMY OF SCIENCES Volume 45 - Number 10 - October 15, 1959 COORDINATE REPRESSION OF THE SYNTHESIS OF FOUR HISTIDINE BIOSYNTHETIC ENZYMES BY HISTIDINE BY BRUCE N. AMES AND BARBARA GARRY NATIONAL INSTITUTE OF ARTHRITIS AND METABOLIC DISEASES, BETHESDA, MARYLAND Communicated by Herman AM. Kalekar, August 20, 1959 Introduction.-In several instances, the rate of synthesis of the enzymes of a bio- synthetic pathway appears to be regulated by the size of the pool of the end product of that pathway.1-4 This phenomenon has been called enzyme repression.2 We have observed repression by histidine during the investigation of the histidine biosynthetic enzymes in histidine-requiring mutants of Salmonella typhimurium.6 The cellular concentration of the four histidine biosynthetic enzymes which were examined were increased about 15-fold by limiting the amount of histidine available to a mutant during growth. A simple method for limiting the availability of histidine in the cell during the entire growth period, and thus increasing the enzyme concentrations, was realized by growing histidine-requiring mutants on a derivative of histidine, formylhistidine, as a source of this amino acid. It appeared, therefore, that the normal low level of the biosynthetic enzymes in wild-type cells grown on minimal medium was probably due to the repression by the normal pool of histidine. of most of the cellular capacity for synthesizing these proteins. This investigation is concerned with utilizing the histidine biosynthetic system from Salmonella to answer the following question: Does the histidine repression of enzyme synthesis affect each of the enzymes of the pathway to the same extent, i.e., is there a parallel increase in specific activity of all four enzymes on lowering the internal histidine pool and a constant ratio of the activity of one histidine enzyme to another independent of the concentration of the enzymes in the cell? A secondary point of interest is whether there is any influence of the concentration of the enzyme substrates on the enzyme synthesis control mechanism. The strains used in this study were some of the several hundred histidine-requiring' mutants of Salmonella that have been mapped by Hartman, et al.6' 7 They were able to demonstrate that each of the mutants could be classified into one of the seven genetic loci, E, F, A, B, C, D, and G, which were closely linked on the chro- mosome in the above sequence. These same mutants were analyzed by us for presence or absence of various enzymes of the histidine biosynthetic pathway., The genetic data taken in conjunction with the biochemical analysis gave more direct support for Hartman's original suggestion8 that the sequence of the genes in the linkage map corresponds to the sequence of the enzymes they control in the biosynthetic pathway. 1453 1454 BIOCHEMISTRY: AMES AND GARRY PROC. N. A. S. The pathway of histidine synthesis seems to involve six enzymes, the last four of which have been studied in this investigation. (1) The first enzyme catalyzes the condensation of phosphoribosyl pyrophosphate (PRPP) with AMP to give an as yet uncharacterized compound called Compound III (Moyed and Magasanik9). This enzyme appears to be lacking in the histidine F mutants in Salmonella.9' 10 (2) The second enzyme converts Compound III to imidazoleglycerol phosphate (IGP) and appears to be controlled by the A gene.9' 10 (3) The third enzyme is IGP dehydrase which catalyzes the conversion of IG1I to imidazoleacetol phosphate (LAP), and is missing in mutants of the B class.5' 11 (4) The fourth enzyme, TAP transaminase, catalyzes the transamination of UAP to histidinol phosphate and is missing in mutants of the C class.' 12 (5) The fifth enzyme histidinol phosphate phosphatase hydrolyzes histidinol phosphate to histidinol.5' 13 No mutants have as yet been found in Salmonella missing only this enzyme (cf. Discussion in Ames, et al.5). The gene for the phos- phatase does appear to be linked to the rest of the histidine genes, however, as certain multisite mutants are missing the phosphatase in addition to the other histidine enzymes. This enzymatic step appears to be experimentally irreversible. (6) The last enzyme in the pathway is histidinol dehydrogenase which oxidizes histidinol to histidine (Adams14), and which is associated with the D gene.5 This enzymatic step also appears to be irreversible. Possible reasons for the histidine requirement of E and G mutants, which seem to have all these enzymes, have been briefly discussed.5 Methods.-The conditions for growing the various mutants, method of making extracts, and assays for the last four histidine biosynthetic enzymes have been described in detail.5 Glutamic dehydrogenase assay: Glutamic dehydrogenase, an enzyme involved in a different biosynthetic pathway, has been assayed as a control in some of the experiments. The reaction catalyzed by the enzyme is: L-glutamate + DPN a-ketoglutarate + DPNH + NH3 + H+. In the assay for this enzyme the DPNH formed in the oxidation of glutamate was coupled, with diphorase, to the reduction of the blue dye dichlorophenolindophenol. The assay was performed in a Cary recording spectrophotometer at 250 by following the disappearance of the blue color of the dye at 600 miu. The assay cuvettes contained: 0.5 ml. of 0.4 mM sodium dichlorophenolindophenol, 0.4 ml of 0.2 M1 triethanolamine-HCl buffer (pH 8.4), 0.005 ml of 50- mM TPN (brought to pH 5 with KOH), an excess of diaphorase (0.01 ml15), and 0.005 to 0.03 ml of dialyzed extract. After the small endogenous oxidation had ceased and the dye was not reduced further, 0.05 ml. of 0.5 M L-glutamate (brought to pH 8.5 with KOH) was added and the rate of dye bleaching determined. The oxidation of 0.01 "mole of glutamate results in a decrease in optical density of 0.3 under these conditions. One unit of enzyme activity is defined as the quantity required for the oxidation of one jimole of glutamate per hour under the assay conditions. Results.-The enzyme levels of hisE-11 during growth on limiting histidine: A "leaky" mutant hisE-i1, which can make some histidine and grow slowly on minimal medium6 has been found to produce large quantities of the histidine enzymes VOL. 45, 1959 BIOCHEMISTRY: AMES AND GARRY 1455 0.7- 0.5 I 0.3 //) >_ -~~~~~~~~~10u H 0.2 _ m )n I P Z H T 0.I o D 0.07->a© 70 <0.05 -i H0.03w 0- H I ~ - -I61 D 2 T -2 -1 0 2 3 HOURS FIG. 1.-The specific activities of four histidine biosynthetic enzymes and glutamic dehydro- genase during the growth of the "leaky" histidine-requiring mutant hiE-1l. The amount of histidine which was added (O.O3,mM) was exhausted midway during the growth period (zero time) and the mutant then grew at a. lower rate which was limited by the small amount of histidine it was capable of making. A liter culture was grown in a two-liter flask, shaken at 370 in a rotary shaker,1' and the opticalodensity readings were determined at various times. The -A- and -0- symbols on the growth curves represent two separate experiments, run under identical conditions, which are both plotted. At the times indicated by the arrows, 100-ml aliquots of the bacterial culture were harvested, cooled rapidly, and centrifuged in the cold. Extracts were prepared from the bacteria, and protein and enzyme were assayed as previously described6 (cf.. Methods). The specific activities-of the phosphatase, P, and glutamic dehydrogenase, ©. have been plotted in the units (/Amoles/mg protein/hour) previously described.5 The dehydrase, D, the transaminase, T, and the histidinol dehydrogenase, H, specific activities have been normalized by multiplying by the factors 1.1, 3.5, and 7.5 respectively. These factors were determined from the slopes of the lines in Figures 3, 4, and 5, and make the specific activities of each of the histidine enzymes ap- proximately equal. during the period of slow growth on minimal medium. The kinetics of enzyme formation Aere examined and are shown in Figure 1. The culture was analyzed for four histidine biosynthetic enzymes during the period of growth on histidine (0.03 mM) as well as during the period after the exhaustion of the exogenous histidine supply when the mutant was growing at its slow "leaky" rate. A control enzyme, glutamic dehydrogenase, which is involved in another amino acid biosynthetic pathway was also assayed in the extracts. Low, wild-type levels of the four histidine enzymes were found during the exponential phase of growth, when histidine was present in excess. When the histidine was exhausted and the growth rate decreased, the specific activity of the histidine enzymes in the cells started to increase rapidly. For mutant hisE-1i the concentration of the enzymes finally approaches a level that corresponds to an eight-fold increase over that found in the wild-type strain. The kinetic data of Figure 1 indicate that, within the limits of accuracy of the assays on crude extracts, the specific activity of each of the histidine enzymes begins to increase at the same time and increases in parallel with the other histidine 1456 BIOCHEMISTRY: AMES AND GARRY PROC. N. A. S. 1.00 0.70 0.3 mMHISTIDINE 0.50 (EXCESS) 0.03 mM HISTIDINE 0.30 /0.0I mM HISTIDINE a) 0.20 z w 0.10 \0.02mM _ FORMYLHISTI DINE ()0.07 <10.050 0.03mM FORMYLHISTIDINE 0 0.03 0.02 0.01 I 0 1 2 3 4 5 6 7 8 9 10 HOURS FIG. 2.-Expt.
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